Thread: 390 or 391?

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What's the difference? How can I tell them apart?

Hey Andy, heres FE #s

FE Casting Numbers
Blocks (C1AE8015C)
390 cid
C1AE-CC1AE-GC1AE-VC2AE-BC
C2AE-BEC2AE-BRC2AE-BSC2SE
C3SE-AC3AE-KYC3ME-BC3AE-AY
C4AE-DC4AE-FC5AE-AC5AE-B
C6MEC6ME-AC8AE-AC8AE-C
C8AE-ED3TE-1D3TE-ACD3TE-HA
D4TE-ACD7TE-BA

406 cid
C2AE-JC2AE-KC2AE-VC2AE-BD
C3AE-DC3AE-V

427 cid
C3AE-MC3AE-ABC3AE-ZC4AE
C4AE-AC5AE-AC5AE-EC5AE-D
C5AE-HC6AE-BC5JE-DC6JE-B
C6AE-CC6AE-DC7AE-AC7JE-A
C8AE-AC8AE-BC8AE-H

428 cid
C6AE-AC6AE-BC6AE-FC6ME
C6ME-AC7MEC7ME-AC8ME

I thought you geezers would know that?

for all you guys thay dont know ,FE does stand for Ford Edsel,or for us ford lovers first everyday!!!!!!!!!!!!!!!!!!!

no no its f___n exspencive

Am I the only one here that cares at all for the FE motors? Well maybe that just because Ive got one and am intending on using it.

I have two with the FE motor,are rats and mice what the pest controll are called to get rid of?. My pest controll for the chevy varmints are a sledge hammer to every one that gets in my driveway,even though I have a chevy when it comes time to repower it wont be with one of the varmint motors.

Who would have thought a bow-tie geek could read? I guess he's reading about the blue ovals to find out where the real power is. Your heading in the right direction now!!!!

Originally posted by techinspector1
Andy, according to my research, the best way to tell a 391 is by the oil drainback hole in the block low on the passenger side about halfway back, just above the pan. This was to drain air compressor oil back to the pan.

The 330MD, 359, 361, 389 and 391 were all designated as "FT" engines as opposed to "FE" passenger car engines. FT's were used in medium and HD trucks. The blocks were cast from a high-grade iron alloy with manganese, silicon and other alloys added to improve durability. Most blocks were strengthened with thicker main caps and main bearing webs. The FT uses the FE oiling system, including hydraulic lifters. A larger distributor shaft bore was used in the FT to accomodate a larger 5/16" HD oil pump drive shaft. FT blocks do not have the "352" cast into the front of the block like FE's. Most, but not all FT's have a mirror image "105" cast into the front of the block. The front snout on the FT's crank is a larger diameter than the FE's, so must be turned down to use FE components on the front of the motor. All FT's used forged cranks. Forged cranks can be identified by a wide parting line as opposed to a very thin line on cast cranks. Also, if the crank is out of the motor, hold it up in the air with a pliers or piece of wire (not held with your hand) and smack a counterweight with a hammer. If it rings like a bell, it's forged. Hope this helps.

I have a 73 motorhome with what I thought was a 390 big block does this means that it most likely is a 391 fe big block. Two barrel carb. Ed ke6bnl So. Calif